Add more modern event handling examples

[nikosandronikos]

There should be some more modern examples of using events in svg, e.g touch events (w reference to touch events spec). Device orientation events might also be of interest.

https://svgwg.org/svg2-draft/interact.html#issue8

[dstorey]

@nikosandronikos is this needed now? Most (all?) of the events are defined in HTML and I don't think there is anything special in regards to SVG that authors need to be aware of? The examples like Touch are kind of outdated now (Touch isn't enabled on desktop...at least in Edge, while input independent Pointer Events are just now seeing wider implementation, including on Desktop)

Should this just defer to HTML?